It's not that it moved, he's stuck to a rock, that's why I think one of the Mexican turbos knocked him down because they've already done it to me before. I have a Fl rhodactis that I have had from the beginning and it has never moved.Shrooms are harder than nems for me when it comes to keeping them where I want them. I currently have a red rhodactis blowing around the tank that I haven't had time to mess with.